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There might be something here. The controls need sorting out a little tho. And you'd get a lot more people playing if you wrote that clue which is necessary for the completion of level 2 ON level 2, rather than on level 3.

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a + d instead of arrows for changing colours would be nice because then you could use a,d and space with one hand :)
and a menu-button is missing ingame (or i couldn't find it :D

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Something rather ctiical left out of the instructions: After you place a red piece next to a blue one, you can remove the blue piece and the red ones will stay. This must be intended and not a bug, cuz level 3 gives you 1 blue cube and 8 reds.